Which of the following is not a characteristic of both surveys and
observational studies?
A. Results are not used to prove cause and effect.
B. Data are collected about a population.
C
C. The researcher does not control or change the population,
D. The researcher exercises direct control over at least one variable.

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Barbara has a good credit history and is able to purchase a car with a low-interest car loan. she co-signs a car loan for her friend jen, who has poor credit history. then, jen defaults on the loan. who will be held legally responsible by the finance company and why? select the best answer from the choices provided. a. barbara will be held legally responsible because she has a good credit history. b. jen will be held legally responsible because she drives the car. c. barbara will be held legally responsible because she is the co-signer. d. jen will be held legally responsible because she has a poor credit history. the answer is a

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?